Apart from this one:-
We did have Migrations when the servers were too full. I remember because Pieces left Draenor for Stormscale because the server lag they were getting even inside Castle Nathria was too much. Some friends also took the opportunity to move.
Blizz just seem to ignore the problem for far too long when it’s the other end of the stick.
They don’t seem to offer FCT/FCM in Retail for underpopulation reasons, only for over population. We really need another round of merges. The last ones ended abruptly and were never started up again.